Find out where to buy the Mast Brother/Solid Sound chocolate bar. There are only 3,500 available, and five contain passes to the Massachusetts music festival.

An extravagant, Willy Wonka–style tip of our top hat to Brooklyn Vegan for the news that limited-edition sea-salt-flavored Mast Brothers chocolate bars are on sale now in select locations. Five of the 3,500 in circulation have tickets to the Solid Sound Festival (solidsoundfestival.com), a three-day blowout curated by Wilco.Buy the distinctive, gold-wrapped bars through the website or at these fine locations: